Bunsen burner.



0. SPAHR & L. J. STRAUSE.

BUNSEN BURNER. APPLICATION rILnD APRJa, 191s.

Patented 001;. 6, 1914.

9u MWI UNITED srAT-Es PATENT OEEIOE..

OTTO SPAHR AND LOUIS J. STRAUSE, 0F PHILAIJELPHIA, PENNSYLVANIA, ASSIG-NORS TO STRAUSE GAS IRON CO., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

BUNSEN BURNER.

Speccation of Letters Patent.

Patented Oct. 6, 1914.

Application led April 18, 1913. Serial No. 761,898.

T0 all 'who/mit may concern Be it known t at we, OTTO SPAHR and LOUIS J. STRAUSE, both citizens of the United States, and residents of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented a certain new and useful Improvement in Bunsen Burners, of which the following is a specification.

Our invention relates to Bunsen burners more particularly of the'type used in con nection with self-heating gas irons and the like, and has for its object to construct such burners in a manner to adapt them for any gas pressure and supply, and to prevent meddling, disarrangement, and incorrect adjust-ment of the parts by uninstructed persons.

Other objects of our improvement will appear from the description hereinafter, and thefeatures of novelty will be pointed out in the appended-claims.

Reference is to be had to the accompanying drawings in which- Figure l is a side elevation, greatly enlarged, of our improved Bunsen burner; Fig. 2 is a central longitudinal section thereof; Figs. 3 and 4 are fragmentary sectional views showing the parts in different positions, and Fig. 5 is a view similar to Fig. 4 showing a diderent form of our improvement.

As shown in the drawings, our invention comprises a body 5 having an annular ange 6 at its one end and an exteriorly scrcvthreaded nipple 7 projecting therefrom, said nipple 7 terminating in a pointed or conical end 8. A passage 9 extends axially through Y said body 5 and nipple 7 and has its inner end preferably tapering and in communication 'with a needle opening 10 located at the apex of the-conical or pointed end' 8 as shown, for instance, in Fig. 2 of the drawings. One or more additional openings 11 extend transversely through the wall of the conical end 8 into connection with the tapering end of said passage 9 for the purpose to be more fully described hereinafter. An air hood, which in the illustration comprises an internally screw-threaded portion l2 and a tapering portion 13 is secured to or forms an integra-l part of` an internally screw- A rotatable or otherwise movable shutter l5 1s mounted on the tapering portionl of the air hood and is provided with apertures 16 adapted to be brought into and out of registry with similar apertures 1T formed 1n the tapering portion 13 and communicating with the interior of the air hood as clearly shown in Fig. 2. In order that the shutter l5 may be retained in an adjusted position and held against accidental movement, a coil spring 18 may be provided, said spring surrounding thercollar 14 and having its one end in engagement with the ange 6 and its other end in engagement with said shutter and serving by means of its tension to hold the shutter 15 firmly in position and yet permitting it to be readily adjusted as may be found necessary. The air hood is formed with an internal shoulder 19 and a wall 20 extending therefrom and spaced from the nipple 7 whereby an annular space 21 is formed between said nipple 7 and wa'll 20 when the parts are assembled. An internally screwthreaded cap 22 is adapted to screw upon the nipple 7 and into said annular space 21 and is formed with an internal chamber 23 having an inclined inner surface, the angle of inclination of .which is preferably different from that of the conical end 8, said cap I22 being adapted to lit said conical end 8 andthe chamber 23 having a gas outlet 24; in axial alinement with and preferably of slightly larger ydiarneter than the needle opening 10. It will be seen that the cap 22y is adjustable on the nipple 7 for the purpose to be more fully described hereinafter, and vin the illustration is maintained in an adjusted position by means of a spring 25 which surrounds the nipple 7 and with one end bears against the shoulder 19 and with itsother end against the cap 22.

In assembling the burner the air .hood with the shutter 15 and spring 18 thereon is secured in operative position by screwing the collar 14 upon the nipple 7 until said collar is firmly. seated against the flange 6. The spring 25 is now placed over the nipple 7 after which the cap 22 is secured on said neck and the entire burner is-combined, for instance, -with a gas iron by simply screwing the portion 12 of the air hood upon the usual fuel inlet tube thereof. The burner may now be connected with .a source of fuel supply by inserting the body 5 into the customary flexible tube used for this purpose, the iange 6 serving to limit the inward movement of said body 5 into the end of the flexible tube. When the cap 22 is screwed all the way up on the nipple 7 as shown in Fig. 2, the apex of the conical end 8 will extend through the gas outlet 24 whereby the latter is completely closed and the transverse opening or openings thus sealed vso that any gas or other fuel entering the passage9 can only escape through the needle opening 10 and gas outlet 24. Underv these conditions the gas or other fuel will pass into the interior of the air hood which may be'termed a mixing chamber at the initial pressure of the fuelsupply to the apparatus and will become mixed with air entering said mixing chamber through the openings 16 and 17, the shutter being adjusted to regulate the amount of incoming air necessary to secure the proper proportions. If it is found-that with the described adjustment of the parts the working is not satisfactory and not suited to the particular fuel pressure the cap 22 may be adjusted so as to move the end 8 out of the gas outlet 24 and leave a. space between the wall ofthe chamber 23 and the outer surface of the conical end 8 as shown in Fig. 3 of the drawings. In this condition of the parts the gas or other fuel will pass through the needle:

opening 10 as before and also 'through the transverse openings 11 into the space between the walls of the cap 22'and conical end 8, from which space the gas or other fuel will pass through the gas outlet 24 to the interior of the air'hood or in other words, to. the mixing chamber, where it becomes mixed with air -entering through the openings 16 and 17. With this adjustment the gas or other fuel escapes through the outlet 24 in a slightly increased quantity and at a pressure somewhat lower than the initial.

pressure of the gas supply owing to the fact that the combined area ofthe openings 10 and 11 is llarger than' the space between the cap 22 and conical end 8. If, however, the cap 22 is brought to the position shown in Fig. 4 and so as to leave-an enlarged chamber beyond the conical end 8, in which chamber the gas or other fuel will be received and collectedat full pressure through the openings 10 and 11 the said gas or other fuel will escape through the gas outlet 24 to the mixing chamber at substantially such full pressure and in larger quantities than before. Thus the burnermay be adapted for various kinds of fuel and for diiferent pressures by simply adjusting the cap 22 as described, which adjustment maybe accomplished inl any suitable manner but is preferably brought about by means cfa suitableinstrument introduced through the openings 16 and 17 and used. as -a lever to'turn said cap 22 as shown in dotted lines-1n Fig. 2,

`quality of gas is different.

the said cap being preferably provided with a milled or otherwise roughened portion 22x to facilitate this opera-tion. To permit of a ready insertion of the said instrument one or more of the openings 16 and 17 may be enlarged or may be of any shape best suited for the purpose. Owing to the fact that this operation would not be explained to an ordinary user of an apparatus including our improved device the same owing to its construction would be free from the danger of tampering and ydisarrangement by unskilled persons, and would be properly adjusted by an expert operator. Such expert operator would set the cap 22 and adjust the air shutter in exact compliance with the requirements of any particular locality, for instance, dierent cities in which the pressure at which the gas is delivered, differs and in which even the Heretofore in gasirons or other apparatus which include Bunsen burners of existing types, the adjusting means for adapting said burners to different local gas conditions has generally been so located or exposed as to be readily tampered with or accidentally disarrangcd whereby the intended adjustment was changed and the burner consequently rendered more or less defective in operation and result. With our invention this is en-'r tirely avoided and each burner may be easily adjusted to all the different pressures at which local` gas or the like may be used, and when once adjusted cannot be disar ranged by accident or otherwise and can only be readjusted when desired.

In the form of our improvement shown in Fig. 5, the nipple .7 is provided with a reduced neck .7a terminating in a. pointed or conical end 8a similar to the end 8 of the first form of our invention. The said neck 7JL is externally screw-threaded to accommodate a cap 22a similar to the cap 22 and provided at its one end preferably with an an- `nular flange 22b or other projection, the purpose of which will appear presently. In this form of our improvement the air hood is formed with an internalshoulder21a located in the annular chamber 21 which shoulder 21a in cooperation with the annular flange 22b serves to-prevent a complete removal o f the cap 22a from the neck 7a t when said cap is actuated for purposes of adjustment. In all other respectsthis latter 4.form of our improvement as well as its method of operation may be the same as in 'the first form of our invention. With'this latter form of our invention it will be seen that it is impossible to completely separate" the cap 22L from the neck 7a when the parts are assembled so that accidental or other dislocation of said cap is prevented without interfering with the actuation or functions j thereof.. Inassembling this form of our improvenient, the cap 22 is first screwed upon the neck 7a after which the air hood is placed in operative position by connecting the collalr 14 with the upper portion of the nipp Various changes in" the specific form shown and described may be made within the scope of the claims without departing from the spirit of our invention.

We claim:

1. In a Bunsen burner, a device adapted for connection with a fuel conducting tube, an apertured air hoo-d detachably connected with said device, an adjustable air regulating shutter on said air hood, means for maintaining said shutter in an adjusted position, a nipple connected With said device and extending into said air hood, a ca p adjustable relatively to said nipple for regulating the fuel pressure and supply in said air hood and means for maintaining said cap in an adjusted position.

2. In a Bunsen burner having a mixing chamber, a conical nipple'having a continuously open outlet aperture at its apex, and

additional outlet openings located adjacent to said apex, andextending at right angles to the axis of the nipple, and a cap having an outlet leading to said mixing chamber, said cap being adjustable relatively to said nipple whereby said additional openings are opened or closed and the outlet of said cap is moved toward 0r away from said conical nipple.-

3. In a Bunsen burner, a device adapted for connection with a fuel conducting tube, an apertured air hood detachably connected with said device, an internal ilangein said air hood, a nipple connected with said device and extending into said' air hood, a cap adjustable on said nipple for regulating the fuel pressure and supplyin said air hood, a projection on said cap adapted to coperate wlth said flange for preventing said vcap 'from being disconnected from the nipple,

and a spring engaging said ca and exert- -f ing a force tending to move said projection toward said flange and adapted to maintain said cap in an adjusted position.

lt -In a Bunsen burnerhaving a` tubular mixing ch amber and air inlets leading therei to, a movable tubular shutter extending over Y `adapted to be brought ,into and out of regissaid mixing chamber and having apertures tryv with said air inlets whereby the supply vof air to the mixing chamber may be reguklated, a shoulder on said burner and a spring v4:having its one end'in engagement with said tapering toward its exit end, said fuel inlet being provided with an axial opening and with transverse openings, and a cap on said inlet provided with an axial opening adapted to communicate with said transverse openings and adjustable to regulate the pressure and supply of fuel in said mixing chamber, said cap being `inclined interiorly at an angle differing from the angle of the taper of said fuel inlet.

6. In a Bunsen burner having a mixing chamber and air inlets leading` thereto, a movable shutter having'apertures adapted to be brought into and out of registry with said air inlets, a shoulder on said burner, a spring having its one end in engagement with said shutter for maintaining said shutter in an adjusted position, an externally screw-threaded fuel inlet leading to said mixing chamber, an internally screw threaded cap arranged to screw on said fuel inlet for regulating the fuel pressure and supply in said mixing chamber,`and a spring engaging said cap and adapted t maintain it in an adjusted position.

7. In a Bunsen burner having an air hood, a fuel inlet leading to said air hood, a cap adjustably mounted on said `fuel inlet and adapted to regulate the pressure and supply of the fuel in and to the airhood and cooperating mearis located respectively on said capy and air hood for preventin said cap from being'diseonnected from sai fuel inlet.

8. In a Bunsen burner having anair'hood, a fuel inlet leading to said air hood, a cap adjustably mounted on said fuel inlet and adapted to regulate the pressure and supply of the fuel in and to the air hood, a p rojection on said cap and an internal projection in said hood adjacent to said cap adapted to coperate with the first named. projection to preventsaid cap from being disconnected from said fuel inlet.

4 In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses. 

